JAVA中，有一个开源软件，JavaPNS实现了Java平台中连接苹果服务器与推送消息的服务。但是在使用的过程中，有两点需要使用者注意一下，希望后续使用的同志们能避免我走过的覆辙。
1、一是向苹果的服务推送消息时，如果遇到无效的deviceToken,苹果会断开网络连接，而JavaPNS不会进行重连。苹果原文：
If you send a notification and APNs finds the notification malformed or otherwise unintelligible, it returns an error-response packet prior to disconnecting. (If there is no error, APNs doesn’t return anything.) Figure 5-3 depicts the format of the error-response packet.
2、JavaPNS是一条条发送通知的，但是对于大规模发送的生产环境，显然是不可以的，建议使用批量发送。苹果原文：
The binary interface employs a plain TCP socket for binary content that is streaming in nature. For optimum performance, you should batch multiple notifications in a single transmission over the interface, either explicitly or using a TCP/IP Nagle algorithm.
对于此，我对JavaAPNS的代码进行了改动，使其支持批量发送和苹果断开重连，但是有一个问题需要大家注意一下，在正常发送的情况下，苹果是不会向Socket中写任何数据的，需要等待其读超时，this.socket.getInputStream().read()，确订推送结果的正常。通过持续的向Socket中写数据，实现批量发送，调用flush方法时，完成一次批量发送。在PushNotificationManager增加如下方法：
public List<ResponsePacket> sendNotification(List<PushedNotification> pnl) {
logger.info(psn + "RR批量推送时消息体的大小为：" + pnl.size());
List<ResponsePacket> failList = new ArrayList<ResponsePacket>();
if (pnl.size() == 0) {
return failList;
}
Set<Integer> sendSet = new HashSet<Integer>();
int counter = 0;
while (counter < pnl.size()) {
try {
this.socket.setSoTimeout(3000);
this.socket.setSendBufferSize(25600);
this.socket.setReceiveBufferSize(600);
for (; counter < pnl.size(); counter++) {
PushedNotification push = pnl.get(counter);
if (sendSet.contains(push.getIdentifier())) {
logger.warn("信息[" + push.getIdentifier() + "]已经被推送");
continue;
}
byte[] bytes = getMessage(push.getDevice().getToken(), push.getPayload(), push.getIdentifier(), push);
this.socket.getOutputStream().write(bytes);
// 考虑到重发的问题
// sendSet.add(push.getIdentifier());
}
this.socket.getOutputStream().flush();
// 等待回馈数据，比单个发送时延时长一点，否则将无法获取到回馈数据
this.socket.setSoTimeout(1000);
StringBuffer allResult = new StringBuffer();
ResponsePacket rp = new ResponsePacket();
int readCounter = 0;
// 处理读回写数据的异常
try {
logger.info(psn + "检查流数据是否可用:" + this.socket.getInputStream().available());
byte[] sid = new byte[4];// 发送标记
while (true) {
int value = this.socket.getInputStream().read();
if (value < 0) {
break;
}
readCounter++;
if (readCounter == 1) {
rp.setCommand(value);
}
if (readCounter == 2) {
rp.setStatus(value);
}
if (readCounter >= 3 && readCounter <= 6) {
sid[readCounter - 3] = (byte) value;
if (readCounter == 6) {
rp.setIdentifier(ByteBuffer.wrap(sid).getInt());
if (failList.contains(rp)) {
logger.error("错误返馈数据中已经包含当前数据，" + rp.getIdentifier());
}
failList.add(rp);
}
}
allResult.append(value + "_");
}
this.socket.getInputStream().close();
} catch (SocketTimeoutException ste) {
logger.debug(psn + "消息推送成功，无任何返回!", ste);
} catch (IOException e) {
logger.debug(psn + "消息推送成功，关闭连接流时出错!", e);
}
logger.info("苹果返回的数据为：" + allResult.toString());
if (readCounter >= 6) {
// 找到出错的地方
for (int i = 0; i < pnl.size(); i++) {
PushedNotification push = pnl.get(i);
if (push.getIdentifier() == rp.getIdentifier()) {
counter = i + 1;
break;
// 从出错的地方再次发送,
}
}
try {
this.createNewSocket();
} catch (Exception e) {
logger.warn("连接时出错,", e);
}
}
} catch (SSLHandshakeException she) {
// 握手出错，标记不加
logger.warn("SHE消息推送时出错,", she);
try {
this.createNewSocket();
} catch (Exception e) {
logger.warn("连接时出错,", e);
}
} catch (SocketException se) {
logger.warn("SE消息推送时出错", se);
counter++;
try {
this.createNewSocket();
} catch (Exception e) {
logger.warn("连接时出错,", e);
}
} catch (IOException e) {
logger.warn("IE消息推送时出错", e);
counter++;
} catch (Exception e) {
logger.warn("E消息推送时出错", e);
counter++;
}
if (counter >= pnl.size()) {
break;
}
}
return failList;
}